CN202206303U - Driving circuit for power switch tubes used in electronic safety device - Google Patents
Driving circuit for power switch tubes used in electronic safety device Download PDFInfo
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- CN202206303U CN202206303U CN2011203654339U CN201120365433U CN202206303U CN 202206303 U CN202206303 U CN 202206303U CN 2011203654339 U CN2011203654339 U CN 2011203654339U CN 201120365433 U CN201120365433 U CN 201120365433U CN 202206303 U CN202206303 U CN 202206303U
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Abstract
The utility model discloses a driving circuit for power switch tubes used in an electronic safety device. The driving circuit comprises a power input end, a power output end, a first power switch tube, a second power switch tube, an auxiliary power supply and a protection signal, wherein the drain electrode of the first power switch tube is connected to an anode of the power input end; the drain electrode of the second power switch tube is connected to the grid electrode of the first power switch tube; the auxiliary power supply is connected to the grid electrode of the first power switch tube through a first connected resistor; and the protection signal is connected to the grid electrode of the second power switch tube through a second connected resistor. The driving circuit for the power switch tubes used in the electronic safety device is simple in circuit structure, reliable in performance and convenient in design and control. The driving circuit is used for N-channel power switch tubes wider in selection and is an ideal circuit used for high-end driving.
Description
Technical field
The utility model belongs to electronic technology field, especially is applied to the power switch tube drives circuit in the electronic security.
Background technology
In industrial control system, to protective circuit require increasingly highly, particularly the requirement of fuse is also increasingly high.In industrial control field, fuse can recover after can being divided into protection, and protects irrecoverable two kinds of back.Protect the recoverable fuse in back owing to practice thrift cost, dependable performance, convenient later maintenance has obtained using very widely at present.
Along with making rapid progress of science and technology, can recover fuse after the protection of industrial control field demand, but have characteristics such as continuous disjunction also can recover, break-time is controlled, the different electric current ranking scores of multichannel are broken communication, overload current can be selected flexibly.To these higher requirements; Fuse can be recovered after common fuse and the protection and these requirements can't be satisfied; So electronic security has also just arisen at the historic moment; And as the design of most important circuit part power switch pipe ON-OFF control circuit in the electronic security, particularly crucial and important.
Generally, the drive circuit of power switch pipe, (concerning inputing or outputing the loop, low side is the ground connection place of voltage, promptly usually said negative pole, the high-end other end that connects and be located in, promptly usually said positive pole at low side.) control than being easier to, the drain electrode of power switch pipe just, source series is in the negative terminal circuit, if select N channel power switching tube, the CONTROLLED POTENTIAL of grid is selected easily like this, circuit is also than being easier to design and realizing.But multichannel output is arranged in electronic security; In most cases be a shared public ground, thus can not place switching circuit at earth terminal, and can only be placed on switching circuit high-end; The drain electrode of power switch pipe just, source series is in the positive pole output of circuit.If selecting for use this moment P channel power switching tube to be one reasonably selects; But often cost is higher for P channel power switching tube, the power switch pipe of big electric current again seldom, to design and produce totally unfavorable; In case and select the problem of N channel power switching tube is to be placed on high-end the driving; So at grid, certainly will to there be driving voltage greater than input voltage (all be reference) just can become reliably between source electrode the two poles of the earth publicly, and also complicacy of the design of drive circuit.
Summary of the invention
The utility model purpose is: a kind of power switch tube drives circuit that is applied in the electronic security is provided.
The technical scheme of the utility model is: a kind of power switch tube drives circuit that is applied in the electronic security, it comprise that power input, power output end, drain electrode link to each other with the positive pole of power input and first power switch pipe, second power switch pipe that drain electrode links to each other with the grid of first power switch pipe, insert accessory power supply and the guard signal that links to each other with the grid of second power switch pipe through the second access resistance that resistance is connected to the grid of first power switch pipe through first.
On the basis of technique scheme, further comprise following attached technical scheme:
The grid of said first power switch pipe connects the anode of first voltage-stabiliser tube and an end of first divider resistance simultaneously, and the negative terminal of first voltage-stabiliser tube connects the negative terminal of second voltage-stabiliser tube, the positive pole of the positive termination power output end of second voltage-stabiliser tube.
The source electrode of said first power switch pipe is through the second divider resistance ground connection.
The grid of said second power switch pipe links to each other with ground through earth resistance, and source electrode then directly links to each other with ground, and wherein the negative pole of power input, power output end, accessory power supply all links to each other with ground.
The utility model advantage is:
The utility model circuit structure is simple, dependable performance, conveniently design, be convenient to control, is the wider N channel power switching tube of selection face simultaneously, also is the ideal circuit of carrying out high-side driver.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the utility model is further described:
Fig. 1 is the circuit theory diagrams of the utility model.
Embodiment
Embodiment: as shown in Figure 1, the utility model provides a kind of specific embodiment that is applied to the power switch tube drives circuit in the electronic security.It comprises that power input (INPUT), power output end (OUTPUT), drain electrode link to each other with the positive pole of power input and the first power switch pipe Q1, the second power switch pipe Q2 that drain electrode links to each other with the grid of the first power switch pipe Q1, insert accessory power supply and the guard signal (CONTROL) that links to each other with the grid of the second power switch pipe Q2 through the second access resistance R 3 that resistance R 1 is connected to the grid of the first power switch pipe Q1 through first; Wherein the grid of the first power switch pipe Q1 connects the anode of the first voltage-stabiliser tube D1 and the end of the first divider resistance R2 simultaneously; The negative terminal of the first voltage-stabiliser tube D1 connects the negative terminal of the second voltage-stabiliser tube D2; The positive pole of the positive termination power output end of the second voltage-stabiliser tube D2, the series connection through first, second voltage-stabiliser tube D1, D2 links to each other and protects the grid safety of the first power switch pipe Q1 thus.The source electrode of the first power switch pipe Q1 is through the second divider resistance R4 ground connection; The grid voltage of the first divider resistance R2 and the second divider resistance R4 moment first power switch pipe Q1 that prevents to begin is unsettled thus; Dividing potential drop through two resistance simultaneously, realize the first power switch pipe Q1 conducting and by.The grid of the second power switch pipe Q2 links to each other with ground through earth resistance R5, and source electrode then directly links to each other with ground.The negative pole of power input, power output end, accessory power supply all links to each other with ground.The first power switch pipe Q1 is used to control the voltage of power output end; Accessory power supply is the 36V direct voltage; And the direct voltage scope of power input is 18-30V; Guarantee grid and the voltage difference between source electrode of the first power switch pipe Q 1 threshold voltage thus, can make the reliable conducting of the first power switch pipe Q1 and end greater than first power switch pipe.During the first power switch pipe Q1 conducting, the voltage of power output end approximates the voltage of power input.Guard signal links to each other with the control port of chip and is used to control the second power switch pipe Q2, and the second power switch pipe Q2 then controls the first power switch pipe Q1, realizes the control of automaticallying switch thus.
When guard signal becomes high level; Cause grid and the voltage difference between the source electrode of the second power switch pipe Q2 threshold voltage greater than the second power switch pipe Q2; After the second power switch pipe Q2 conducting, the grid of the first power switch pipe Q 1 is an electronegative potential, and the grid of the first power switch pipe Q 1 and the voltage difference of source electrode are less than the threshold voltage of the first power switch pipe Q 1; The first power switch pipe Q 1 is become by conducting state and ends the power remove of power output end.
When guard signal becomes low level; Cause grid and the voltage difference between the source electrode of the second power switch pipe Q2 threshold voltage less than the second power switch pipe Q2; The second power switch pipe Q2 by after, the grid of the first power switch pipe Q 1 is a high potential, the grid of the first power switch pipe Q 1 and the voltage difference of source electrode are greater than the threshold voltage of the first power switch pipe Q 1; Power switch pipe Q 1 becomes conducting by cut-off state, the power supply of power output end output thus.
In sum, control the conversion of guard signal high-low level through chip, the conducting of the may command first power switch pipe Q1 and by, come to control simultaneously the output of power output end, realized the high-end control of N channel power switching tube.Solved power switch pipe simultaneously and be applied in the circuit high-side driver, can not adopt P channel power switching tube, and adopted the design of N channel power switching tube, and under the input of 24V rated voltage, in the change in voltage scope of 18-30V, still can reliably drive.
Certainly the foregoing description only is the technical conceive and the characteristics of explanation the utility model, and its purpose is to let the people who is familiar with this technology can understand content of the utility model and enforcement according to this, can not limit the protection range of the utility model with this.All equivalent transformation or modifications of doing according to the spirit of the utility model main technical schemes all should be encompassed within the protection range of the utility model.
Claims (4)
1. power switch tube drives circuit that is applied in the electronic security is characterized in that: it comprise that power input, power output end, drain electrode link to each other with the positive pole of power input and first power switch pipe, second power switch pipe that drain electrode links to each other with the grid of first power switch pipe, insert accessory power supply and the guard signal that links to each other with the grid of second power switch pipe through the second access resistance that resistance is connected to the grid of first power switch pipe through first.
2. power switch tube drives circuit according to claim 1; It is characterized in that: the grid of said first power switch pipe connects the anode of first voltage-stabiliser tube and an end of first divider resistance simultaneously; The negative terminal of first voltage-stabiliser tube connects the negative terminal of second voltage-stabiliser tube, the positive pole of the positive termination power output end of second voltage-stabiliser tube.
3. power switch tube drives circuit according to claim 2 is characterized in that: the source electrode of said first power switch pipe is through the second divider resistance ground connection.
4. according to claim 1 or 2 or 3 described power switch tube drives circuit; It is characterized in that: the grid of said second power switch pipe links to each other with ground through earth resistance; Source electrode then directly links to each other with ground, and wherein the negative pole of power input, power output end, accessory power supply all links to each other with ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203654339U CN202206303U (en) | 2011-09-28 | 2011-09-28 | Driving circuit for power switch tubes used in electronic safety device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203654339U CN202206303U (en) | 2011-09-28 | 2011-09-28 | Driving circuit for power switch tubes used in electronic safety device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202206303U true CN202206303U (en) | 2012-04-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203654339U Expired - Fee Related CN202206303U (en) | 2011-09-28 | 2011-09-28 | Driving circuit for power switch tubes used in electronic safety device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202206303U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102324834A (en) * | 2011-09-28 | 2012-01-18 | 魏德米勒电联接国际贸易(上海)有限公司 | Be applied to the power switch tube drives circuit in the electronic security |
| CN112822796A (en) * | 2020-12-31 | 2021-05-18 | 江西江铃集团新能源汽车有限公司 | PTC device control circuit |
-
2011
- 2011-09-28 CN CN2011203654339U patent/CN202206303U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102324834A (en) * | 2011-09-28 | 2012-01-18 | 魏德米勒电联接国际贸易(上海)有限公司 | Be applied to the power switch tube drives circuit in the electronic security |
| CN112822796A (en) * | 2020-12-31 | 2021-05-18 | 江西江铃集团新能源汽车有限公司 | PTC device control circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120425 Termination date: 20190928 |